A team of scientists has found that the H9N2 bird flu virus, often considered minor due to its limited impact on birds, has the potential to spark a human pandemic.
Experiments suggest that H9N2 has adapted to human cells, although cases of person-to-person transmission have not been reported yet.
The researchers say more surveillance of the virus is needed.
The focus has been on the avian influenza virus H5N1 in recent years, but scientists are now concerned about the spread of other bird viruses, including H9N2.
Author's summary: H9N2 bird flu strain may cause human pandemic.